Suppose you wanted to recrystallize a 10.0-g sample of acetanilide from water. A

Question

Suppose you wanted to recrystallize a 10.0-g sample of acetanilide from water. Answer the following questions using the water solubility information given: Temperature (degree C): 0 degree 80 degree 100 degree Solubility, g/100 ml. water 0.53 3.5 5.5 How much boiling water would be necessary to dissolve the 10.0 g of acetanilide? How much of the 10.0 g of acetanilide would be left behind in the filtrate if crystallization and filtration were carried out at 0 degree C? What would be the maximum expected % recover of the acetanilide? % recovery = g obtained as crystals/g sample used for crystallization times 100

Explanation / Answer

1. At 100oC: 5.5g /100mL= 10/x Therefore mL of solvent = 181.8mL

2. At 0oC : 0.53g/100mL= x/181.8mL. Therefore the amount of salt remaining in filtrate at 0oC= 0.963g

3. (10g-0,963g) = 9.036 g

% recovery= 9.036/10X100= 90,36%

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